Added secret tips for each hole

Added signs with the hole numbers, pars and the best it was achieved on each hole at the moment.

Put an arrow and a tunnel on hole 5 because some people got confused with the path when coming from the right side.
Fixed hole 6. Put some walls after the tube drop because sometimes the ball would go out.
Fixed the hole with jump through 3 tunnels that with collision on sometimes would get the ball stuck inside the tunnels or sometimes the ball would get stuck between the ramp and the arrows.
Made some minor alterations to the environment
Fixed 1 tree that was floating. Fixed another tree that was clipping.

Fixed a tree that was clipping through another object.
Changed the par of Hole 7 to 5 instead of 4 because of the difficulty. (although it's possible to do it in 4)
Put some more speed arrows on the tubes of Hole 11 because sometimes the ball would get stuck there.

Fixed hole 18 that could make you jump out of the wooden tube. Made closed tubes at the start and the end.

Reverting so I can get something back.

Fixed hole 18 that could make you jump out of the wooden tube. Made closed tubes at the start and the end.